Question

Ratio of total surface area of sphere and hemisphere is

Answer 1

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HerE IS YouR AnsweR———
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Total surface area of sphere = $4\pi {r}^{2}$

Now,Total surface area of hemisphere=$2\pi {r}^{2}$

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acc. to given condition ———

$\frac{total \: surface \: area \: of \: sphere}{total \: surface \: area \: of \: hemisphere} \\ \\ = \frac{4\pi {r}^{2} }{2\pi {r}^{2} } \\ \\ \: \: (\pi \: and \: r {}^{2} \: cancelled) \\ \\ = \frac{4}{2} \\ \\ = \frac{2}{1} \\ \\ = 2:1$
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therefore, the ratio between the total surface area of sphere and hemisphere is 2:1

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